We have a Britax car seat for DS(4). Not sure which model but it starts as a stage two seat with a five point harness, turns into a stage three with the seat belt over and can then be used as just a booster seat. We are really unhappy with it and would appreciate advice on good seats of this type. The problem is that he is now too big for the five point harness (has been for ages) and the option with the adult seat belt seems to be a pile of poo. It has a clip at the soulder that the adult belt goes through which holds it tight so there's no give in the belt. This means that at the beginning of the journey he can't move but by the end, he's wriggled so much that it has come loose and is all sort of hanging off him. Obviously not at all safe. I think he probably still needs a five point but can't get them big enough. I would appreciate advice on a good car seat for him. Thanks for reading all that, why use one word when twenty will do!!